Quote by Myrrhhhhhh
In addition to my prior reply, I'd say in the sea, by the buoy with a dropped weight to 30m while my buddies were about a hundred meters away chatting with another group of divers. Then I saw bubbles below.
SCUBA divers were hand signaling
They were also staying at the same resort as us.
Still this above....the other one was in the in AV room of my Medical-Surgical Nursing class but was quite discreet being handsfree